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Related Concept Videos

Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

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Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

Acute Kidney Injury IV: Diagnostic Studies and Prevention

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Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
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Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

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The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
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Kynurenic Acid Is a Predictive Prognostic Metabolic Marker in ST-Elevation Myocardial Infarction.

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Kynurenic acid (KYNA), a tryptophan metabolite, is elevated in ST-elevation myocardial infarction (STEMI) patients and predicts adverse cardiovascular events and mortality. This finding highlights KYNA as a potential biomarker for STEMI progression.

Keywords:
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Area of Science:

  • Biochemistry
  • Cardiovascular Medicine
  • Metabolomics

Background:

  • The tryptophan/kynurenic acid (KYNA) pathway influences inflammation, oxidative stress, and immune responses.
  • The role of KYNA pathway metabolites in the early diagnosis and prognosis of ST-elevation myocardial infarction (STEMI) requires further investigation.

Purpose of the Study:

  • To evaluate the prognostic significance of KYNA in STEMI patients.
  • To explore the association between KYNA levels and major adverse cardiovascular events (MACEs) and all-cause mortality.

Main Methods:

  • Untargeted metabolomics using 1H-nuclear magnetic resonance (NMR) to compare metabolite profiles in STEMI patients and controls.
  • Targeted metabolomic analysis (LC-Q-TOF MS) to assess KYNA's association with STEMI prognosis.
  • Analysis of KAT1 expression in macrophages within thrombus and peri-infarct myocardial tissues.

Main Results:

  • Fifteen differential metabolites were identified between STEMI patients and controls.
  • KYNA levels were significantly higher in STEMI patients (337.67 nmol/L IQR: 241.16-500.29 nmol/L).
  • Elevated KYNA was associated with increased risk of MACEs (HR: 5.95) and all-cause mortality (HR: 7.11), showing moderate predictive value (AUCs 0.72-0.74).
  • KAT1 expression was upregulated in macrophages in STEMI-related thrombus and myocardium.

Conclusions:

  • KYNA levels may reflect the acute phase of myocardial infarction.
  • KYNA shows promise as a biomarker for predicting STEMI progression and patient outcomes.